package Object_4;

public class Car {
    private Tire tire;
    private Engine engine;
    private VehicleSystem vs;
    //组合--》has-a

    public static void main(String[] args) {
        String str = "Java";
        System.out.println(str);


    }

}

class Tire{

}

class Engine{

}

class VehicleSystem{

}

